Ablock with a volume of 12cm has a density of 3cm. the block is cut into two pieces. one piece has a volume of 8cm, and the other piece has a volume of 4 cm. what are the densities of the two?

Density does not change when you divide the cube, due to the principle of mass conservation. The density given in this case by 3 , will remain the same.

The only way for it to change, will be if you compressed the block, so now the same mass will be compressed in less volume, or you add heat to the system.

Explanation:

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explanation:

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.